1. tpaccagnella@arpa.emr.it EGU 2011 TIGGE, TIGGE LAM and the GIFS T. Paccagnella (1), D. Richardson (2), D. Schuster(3), R. Swinbank (4), Z. Toth (3), S. Worley (3)………………. ………………………………………….. (1) ARPA-SIMC, Italy (2) ECMWF, UK (3) NCAR, USA 4) Met Office, UK

2. tpaccagnella@arpa.emr.it EGU 2011 TIGGE data  A phased approach was chosen beginning with mirrored data collections of global medium-range ensemble forecasts from 10 NWP providers at three TIGGE Archive Centres: CMA, ECMWF, and NCAR.  TIGGE data is made available for research after a 48-hour delay. Near real-time access may be granted for specific projects through the THORPEX International Project Office.

3. tpaccagnella@arpa.emr.it EGU 2011 Summary of TIGGE database Centre Ensemble members Output data resolution Forecast length Forecasts per day Fields (out of 73) Start date BOM331.50º x 1.50º10 day2553 Sep 07 CMA150.56º x 0.56º10 day26015 May 07 CMC210.9º x 0.9º16 day2563 Oct 07 CPTEC150.94º x 0.94º15 day2551 Feb 08 ECMWF51 N200 (Reduced Gaussian) N128 after day 10 15 day2701 Oct 06 JMA510.56º x 0.56º9 day1611 Oct 06 KMA171.00º x 1.00º10 day24628 Dec 07 Météo-France111.50º x 1.50º2.5 day26225 Oct 07 NCEP211.00º x 1.00º16 day4695 Mar 07 UKMO240.83º x 0.55º15 day2711 Oct 06 Ten of the leading global forecast centres are providing regular ensemble predictions to support research on predictability, dynamical processes and development of probabilistic forecasting methods.

4. The TIGGE Archives have great value for the users, because standards for data format, parameter fields, and transfer protocols were internationally agreed upon at the start. TIGGE ARCHIVES CHARACTERISTICS  All data are archived at native resolution (on native grid when possible)  Data are interpolated on any limited-area lat-lon grid defined by the user just before download  Field names, definitions, units, accumulation times, etc… are fully standardized  Data gaps are continuously monitored and every effort is made to repair them quickly  Data can be obtained either in GRIB2 or NETCDF format (only from NCAR at the moment)  More functionalities will be installed (e.g. access to single point data, automatic requests, local calculation and plot generation, etc…) depending on user numbers, requests and funding

5.  The ICT systems run 24 hours per day x 7 days per week, collecting data from the providers, validating the data integrity and completeness, and supporting user access.  Currently, the TIGGE archive is growing with more than over 1.7 M fields and 500 GB per day.  User activity continues to improve. Currently approximately 50 active users (submitting multiple requests) trigger data processing on 15 TB and download 1 TB monthly. TIGGE ARCHIVES CHARACTERISTICS

6.  Fast user access to the complete archive, now 425 TB, is a technical challenge.  Delivery systems at ECMWF are fairly well suited to this challenge, while NCAR has found it necessary to place more data online and boost server side computational power. A new validation data portal is being designed and will be coupled to the TIGGE access portal at NCAR. Having the forecast fields and observations available from the same interface will further support the TIGGE program objectives. TIGGE ARCHIVES CHARACTERISTICS